Looking for a tech job? Wondering which tech companies are the best ones to work for and why? Fortune magazine just announced its 16th annual list of the "100 Best Companies To Work For," including a number of tech titans and technology innovators.

We sorted through their rankings to find which tech companies made the grade. Read on for the list and some of the reasons these tech companies have made it to the top.

Google Ranks First

It seems everybody and their brother wants to work for Google. What makes Google so great? Fortune writes: "The Internet juggernaut takes the Best Companies crown for the fourth time, and not just for the 100,000 hours of subsidized massages it doled out in 2012." New this year are three wellness centers and a seven-acre sports complex, which includes a roller hockey rink; courts for basketball, bocce and shuffle ball; not to mention the horseshoe pits.

With an estimated total of 34,311 employees, Google is based in Mountain View, California, and is taking the top spot on Fortune's Best Companies list now four years in a row.

SAS Gets Creative

SAS Institute was third on Fortunes' list last year and now ranks second among all companies. Based in Cary, North Carolina, SAS develops software for data analytics and data management. SAS has a corporate culture described by one employee as "creative anarchy" that is especially conducive to innovation.

The company has 6,373 employees in the U.S. with another 6,481 employees worldwide, and was one of the first tech companies to offer on-site childcare as a benefit for employees.

NetApp Ranks Sixth

Based in Sunnyvale, California, data storage company NetApp believes in recognizing its employees for a job well done. According to Fortune, "Vice chairman Tom Mendoza asks managers to notify him when they 'catch someone doing something right' and then calls 10 to 20 employees every day to thank them."

Fortune reports NetApp has 7,426 employees in the U.S. plus 4,723 outside the U.S.

Ultimate Software in Top 10

Ranking ninth and headquartered in Weston, Florida, with close to 1,500 employees, Ultimate Software develops people management software, with customers like Google, Quicken Loans, and the New York Yankees.

Fortune reports that the company covers 100 percent of health care premiums for its employees and dependents, and treats workers to a free vacation every two years.

Qualcomm Moves Up List

Based in beautiful San Diego, California, Qualcomm ranked 23rd on last year's list of best companies to work for. Now, the company has edged up to number 11, with 15,693 employees in the U.S. and another 8,675 worldwide.

The wireless technology company encourages employees to share ideas, particularly at its annual in-house tech conference, with rewards attached. In 2012, Qualcomm engineers submitted nearly 200 papers, and winners were then asked present at the forum and participate in followup speaking events.

Salesforce.com's Fifth Year Listed

Ranking 19th, and moving up from spot 27 last year, the CRM software developer and cloud-computing pioneer offers tons of perks, Fortune reports, including free yoga classes, 48 hours of paid time to volunteer, a $100 monthly wellness benefit, iPhone reimbursement, and a quarterly companywide forum. Salesforce.com is based in San Francisco, California, and according to Fortune, has 5,474 employees in the U.S., plus 3,069 outside the U.S.

Kate FitzGerald, who is VP of Worldwide Sales, Service Cloud, attributes part of the company's success to teamwork and motivation. "Salesforce.com has always done a good job building teamwork and making people feel part of the results. This not only makes people more engaged, but reinforces their self-worth and continued motivation."

Intuit Interests Employees

Another California company based in Mountain View made the list: Intuit, maker of QuickBooks and TurboTax accounting software, is high on the list of best companies to work for, ranking 22nd.

Intuit encourages employees to spend 10 percent of their time pursuing projects they're passionate about. The best idea won a million bucks last year. The company employs 7,405 in the U.S. plus another 970 worldwide.

World Wide Technology Wins

Coming in at number 24, World Wide Technology provides high-tech gear and services. The company, based in St. Louis, Missouri, does well by its employees and has made the list 2 years in a row now.

Fortune says World Wide Technology gives 3 percent of net income profit sharing and matches 100 percent of employee contributions to 401(k) plans, up to 6 percent of pay. Roughly 1,845 employees are with the company, located primarily in the U.S.

Rackspace Hosting Is Hot

Based in San Antonio, Texas, Rackspace Hosting, best known for its IT cloud services, gives employees stock options as a benefit and offers weekend trips to top performers. Considering the fast growth of RackSpace stock, you can see why employees would love to work there.

Rackspace is 34th on the overall list, with 3,571 U.S. employees plus 877 worldwide.

Ranking at number 42, Cisco is still a favorite among tech companies to work for. Cisco lets 95 percent of its workers tap into flexible work options. One employee told Fortune, "The fact that I am given so much flexibility makes me want to go above and beyond."

The tech behemoth is based in San Jose, California and employs a whopping 35,336 in the U.S. plus another 29,434 around the world.

Hitachi Data Systems

Fortune reports that when you work at Hitachi Data Systems, you get quarterly bonuses based on both individual and corporate performance that can range from one-third to two-thirds of base salary.

The company is headquartered in Santa Clara, California, with 2,216 employees in the U.S. plus 2,925 outside the U.S. This is the second consecutive year HDS has been named on Fortune's list, moving up to number 63 from number 86 last year.

Despite dropping from 46 to 68 on the list, Intel employees are still enviable. According to Fortune, the chipmaker offers $50,000 for tuition reimbursement, on-site medical care, and an eight-week paid sabbatical every seven years, taken last year by 4,067 employees.

Based with numerous other tech titans in Santa Clara, California, Intel employs a massive workforce of 48,350 in the U.S. and another 44,516 more worldwide.

Microsoft Still Mighty

Ranking 75th on the list, software leader and innovator Microsoft, based in Redmond, Washington, is still one of the most popular technology employers. Fortune reports the company's campus outside Seattle has a new health center with primary care, a pharmacy, a chiropractic clinic, lab tests, and wellness coaching.

The company employs the largest workforce on our list, with 55,455 in the U.S. plus 38,835 more around the world.

TEKsystems

Last but not least on our compilation of best tech companies to work for, based on the Fortune rankings, is TEKsystems, with 3,165 employees in the U.S. plus 306 outside the U.S.

Based in Hanover, Maryland, TEKsystems ranks 79th on Fortune's list, with an interesting corporate culture. The magazine says, "Culture at the IT staffer revolves around 'open-book relationships'; workers are expected to share 'almost everything' about their personal and professional lives."

Survey Methodology

To compile the full list of "100 Best Companies To Work For," Fortune partnered with the Great Place to Work Institute, conducting what they describe as "the most extensive employee survey in corporate America." For this year's list, 259 firms participated in the survey, with more than 277,000 employees at those companies responding.

Two-thirds of a company's score is based on the results of the Institute's Trust Index survey, which was sent to a random sample of employees from each company. The survey asks questions related to employee attitudes about management's credibility, job satisfaction, and camaraderie.

The other third is based on responses to the Institute's Culture Audit, which includes questions about pay and benefit programs, plus a series of open-ended questions about hiring practices, internal communication, training, recognition programs, and diversity efforts.

Any company that is at least five years old and has more than 1,000 U.S. employees is eligible to participate. The deadline for applying for next year's list is July 1, 2013, with online nomination forms available on the Great Place to Work Institute website.